Can testify to the quality of Wisport products as my primary backpack is a small Wisport Sparrow, and it has held up phenomenally after taking it travelling. The capacity of the bag is 55L, however you can increase the capacity of the pack by 12L by fully extending the hood inside and extending the straps, and the two side pouches can be detached and attached easily using small clips. Backpack has never been used and was purchased for a camping trip over the summer that didn't end up happening, as such it still has all of its tags remaining.